by using property of rank i
was solved this problem
Let ne Nj. Prove that n < 2(6(n)).
Let U ? Rmxn. Prove that if UTI-In, then n < m.
Q5. Suppose YON,(, oʻ1) and X is a n xp matrix of constants with rank p (<n). a) Show that A = X(X'X)'X' and I - A are idempotent and find the rank of each. b) If u is linear combination of columns of X i.e. u=Xb for some b find E(Y'AY) and E(Y'(I - A)Y) where A is an in (a) c) Find the distribution of Y'AY/? & Y'(I - A)Y/02 d) Show that Y'AY & Y'(I – A)Y...
(6) Let A denote an m x n matrix. Prove that rank A < 1 if and only if A = BC. Where B is an m x 1 matrix and C is a 1 xn matrix. Solution (7) Do the following: (a) Use proof by induction to find a formula for for all positive integers n and for alld E R. Solution ... 2 for all positive (b) Find a closed formula for each entry of A" where A...
, then n lim Let Ά be a square matrix. Prove that if ρ(A)<1 Use the following fact without proof. For any square matrix A and any positive real number ε , there exists a natural matrix norm I l such that l-4 ll < ρ (d) +ε IIA" 11-0
Prove that if |A| = |Band [B<|A|, then |A| = |B).
2. (D5) Let n = o(a) and assume that a =bk. Prove that <a >=<b> if and only if n and k are relatively prime.
IDY in < oo and lim - Yn < 0o. Prove that lim,+ 1. Let In > 0. Yn > 0 such that lim,- Yn) < lim,-- In lim,+ Yn: i tn < oo and lim yn < . Prove that lim. In 1. Let In 20, yn 0 such that lim Yn) < limn+In lim + Yr
Let X be a continuous random variable. Prove that: P(21-; < X < xạ) = 1 - a.
let a,b > 0 . Prove that
DI < Val